EP0676874A3 - Method and apparatus for sequential cancellation of multiple access interference in a CDMA receiver - Google Patents

Method and apparatus for sequential cancellation of multiple access interference in a CDMA receiver Download PDF

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Publication number
EP0676874A3
EP0676874A3 EP95103484A EP95103484A EP0676874A3 EP 0676874 A3 EP0676874 A3 EP 0676874A3 EP 95103484 A EP95103484 A EP 95103484A EP 95103484 A EP95103484 A EP 95103484A EP 0676874 A3 EP0676874 A3 EP 0676874A3
Authority
EP
European Patent Office
Prior art keywords
symbol
baseband signal
multiple access
code
cdma receiver
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95103484A
Other languages
German (de)
French (fr)
Other versions
EP0676874B1 (en
EP0676874A2 (en
Inventor
Hiroki Oki Electric Ind. Co. Ltd. Sugimoto
Ikuo Oki Electric Ind. Co. Ltd. Kawasumi
Kenji Oki Electric Ind. Co. Ltd. Horiguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
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Filing date
Publication date
Application filed by Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Publication of EP0676874A2 publication Critical patent/EP0676874A2/en
Publication of EP0676874A3 publication Critical patent/EP0676874A3/en
Application granted granted Critical
Publication of EP0676874B1 publication Critical patent/EP0676874B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7107—Subtractive interference cancellation
    • H04B1/71072—Successive interference cancellation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A code-division multiple-access receiver carries out the following steps whenever it recognizes a symbol boundary in the received baseband signal. First, using the despreading code of the relevant station, it estimates the value of the symbol. Next, using the spreading code of the station, it estimates an interference signal, and modifies the baseband signal by subtracting the interference signal. These steps can be iterated for each symbol. The iterations can be organized into stages, with estimated symbol values from one stage passed to the next stage for use in estimating new symbol values in that next stage. At the end, the remaining baseband signal can be used to adjust the final estimated symbol values.
EP95103484A 1994-03-10 1995-03-10 Method and apparatus for sequential cancellation of multiple access interference in a CDMA receiver Expired - Lifetime EP0676874B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP3942194 1994-03-10
JP3942194 1994-03-10
JP39421/94 1994-03-10

Publications (3)

Publication Number Publication Date
EP0676874A2 EP0676874A2 (en) 1995-10-11
EP0676874A3 true EP0676874A3 (en) 2000-05-10
EP0676874B1 EP0676874B1 (en) 2003-06-11

Family

ID=12552526

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95103484A Expired - Lifetime EP0676874B1 (en) 1994-03-10 1995-03-10 Method and apparatus for sequential cancellation of multiple access interference in a CDMA receiver

Country Status (4)

Country Link
US (1) US5579304A (en)
EP (1) EP0676874B1 (en)
KR (1) KR950035142A (en)
DE (1) DE69531020T2 (en)

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Also Published As

Publication number Publication date
US5579304A (en) 1996-11-26
DE69531020T2 (en) 2004-04-29
EP0676874B1 (en) 2003-06-11
EP0676874A2 (en) 1995-10-11
DE69531020D1 (en) 2003-07-17
KR950035142A (en) 1995-12-30

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